中国激光, 2016, 43 (2): 0203008, 网络出版: 2016-01-25   

激光喷丸IN718 镍基合金残余应力高温松弛及晶粒演变特征 下载: 706次

Thermal Relaxation of Residual Stress and Grain Evolution in Laser Peening IN718 Alloy
作者单位
江苏大学机械工程学院, 江苏 镇江 212013
摘要
为研究激光喷丸镍基合金残余应力的高温松弛行为,首先对IN718 合金进行单次激光喷丸强化,随后,对喷丸后试样进行高温保持,对比分析了不同保温温度和不同保温时间下残余应力值、半峰宽值(FWHM)变化及晶粒演变特征。结果表明,激光喷丸后,喷丸区域呈残余压应力状态,FWHM 值升高,近表层材料晶粒明显细化;高温保持过程中试样的残余应力松弛量与保温温度和保温时间呈正相关。应力松弛速率在保温初期较大,随后逐渐减小。保温温度为800 ℃,保温时间为300 min 时,残余应力松弛量最大,松弛幅度达82.14%。保温温度一定时,材料表面FWHM 值下降幅度随保温时间的增大而增大,600 ℃保温温度下,FWHM 值变化不明显。600 ℃保温300 min 后材料的晶粒尺寸仍较小,晶粒细化效应仍然显著,而800 ℃保温下晶粒长大迅速,保温300 min后材料的晶粒细化效应基本消失。
Abstract
In order to explore the thermal relaxation behavior of residual stress induced by laser peening on the surface of Nickel- based alloy, a single laser peening treatment is conducted on the surface of IN718 samples, followed by a series of thermal insulation tests conducted on these treated samples. Then the changes of the residual stress, full width at half maximum(FWHM) and grain evolution feature at various test temperatures and exposure time are analyzed. The results show that laser peening can induce compressive residual stress at treated region, enhance the magnitude of FWHM and obviously refine the grains in the near-surface of the material. During the thermal insulation tests, the relaxation magnitude of residual stress is positively correlated with the test temperature and the exposure time. The relaxation speed of residual stress appear to be relatively high during the initial period of exposure, and then slow down with the increases of exposure time. After being exposing by 300 min at 800 ℃, the residual stress relax at a maximum rate of 82.14%. When the test temperature is constant, there is an increase in FWHM value as the exposure time increase. At the test temperature of 600 ℃, the value change of FWHM is found to be slight. After being exposing by 300 min at 600 ℃ , the grain size is still small, which means that the grain refinement effect is still obvious. However, at the test temperature of 800 ℃, the grain grow rapidly so that after being exposing by 300 min, the grain refinement effect almostly disappear.

章海峰, 黄舒, 盛杰, 徐苏强, 韩煜航, 周建忠. 激光喷丸IN718 镍基合金残余应力高温松弛及晶粒演变特征[J]. 中国激光, 2016, 43(2): 0203008. Zhang Haifeng, Huang Shu, Sheng Jie, Xu Suqiang, Han Yuhang, Zhou Jianzhong. Thermal Relaxation of Residual Stress and Grain Evolution in Laser Peening IN718 Alloy[J]. Chinese Journal of Lasers, 2016, 43(2): 0203008.

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